Valve grinding and reseating tool.



W. B. MARTIN.

VALVE GRINDING AND RESEATING TOOL.

APPLIcAmN FILED APR. 6, 1911.

` L. f Patented Dec. V3, i918.

7 nascar. i

To azz whom a may femm.-

St.laul, in thecounty ofltamsey and il rar l WALLACE B. MARTIN, orsr. PAUL, MINNESOTA.

vara/'E enINDiNe JaNn nnsna'rINe rrooL.

Be it known that 1, WALLACE a citizen of the` United States,

` Reseatingf'lools; and l do` hereby declare thefollowing toghe a fulhcleary` and exact description ofthe invention, suchasf will en- `ablefothers skilled inthe ar't to whichitap- `1"ypertains to make and use the same.`

My invention relates to `valve grinding and reseating tools; and, to this end,:`it con- """`sists ofthe novel devices and combinations lof devices hereinafter described and defined f ill `the claims. v t

ln `the accompanying drawings, `which "fillustrate the invention,vlikecharacters inviews. Referringto the drawings, y y

`lBigure 1 is a fragmentary plan viewyof y dicate like parts throughout the "several an internal combustionengine to which is secured, `in working position, the improved .25.

tool, some parts being shown inditl'erent positions by means ofbroken lines;

Fig. 2 is 'a fragmentary View, partly in i plan and partly inhorizontal section of the y y tooland the cylinder casting, onan enlarged scale; and l y lFlg. 3 ls a v1ew,pr1nc1pally `1n side elevaparts sectioned on the line For the purposeof illustrating the valve lgrindin and reseating tool" in operative position, tiere is `illustrated in `the drawings an internal combustion engine, of the Ford y type. Ofthe partsof the engineillustrated.

the numeral 7 `indicates the `cylindercasting having therein cylinders 8, valves 10 and seats 9 for said valves. The cylinder head 11 is detachably secured by bolts 12 in position on the casting 7.` lt is important to note `that the bolts 12 extend loosely through 'bolt holes in the cylinder headll and` their l ends have screw-threaded engagement with `looltholes 13 in the cylinder casting?. lit

' will also be noted,`there is one ofthese bolt ,holes 13 located equi-distant. betweeneach Specification of Letters Patent.

application sled april e, 1917. serial Nogieaise. y y

Patented nee; a, raie.

pair of valve seats 9. In the ftop `ofleach `valve 10, is a pair `of diametrically opposite wrench pin holeslll;

Referring Vnowin "detailto the invention, i

the numeral indicates `a castbearing head comprising upper `and lower plates ,connectzed byacentrallylocated web." "1n the rear endof the bearing `head 15, is abore which extends `completely through both platesf thereof andalordsa seat 16, andlikewise,

there is a bore in theifront end of said head which affords a seat 17 Extendingthrough the seat 16, isa supporting rod 18,fon which "the bearing head 115 is freeto swing laterally l and move upward` or `downward thereon. l

As shown, the supportingrod 18 is inthe threads of the samegpitch. Preferablmfone Placed on the screw#threaded end of the stop shoulder 19. The supporting rod 18 `is thesame into theholt hole 13 between a pair "of the valve seats 9 that "areto be ground." To rigidly hold the bearing head 15 against "lateral` swinging movement with its ,formof a headed boltyof the same dia1neter asone of the` bolts 12, and has screw of the bolts 12, removed rrom the cylinder head 11, is used for the supporting rod 18.

supportingrod 18, isa nutwhich acts as a rigidly "securedto `the casting 7 by'screwing `seat17 `axially alined over either one ofthe respective seats 9,\there`is provided an anchor pin 20; This anchor pin 20is arranged to project through either one of two` holes `21 .formed in ears 22 on" the longitudinal edges ofthelower plate of the bearing 15 and are located equi-distant from the axis of the supporting rod 18. 'llhe anchor pin 20 is port for the hearing head1?) and holdsthe "upwardly tapered and also affords a supsame clear 'of the shoulden 19. lntegrally" formed with the anchor `pin 20, is a base 23 whichrests directly on the `top of the cylinder casting 7 and is providedwith a hole 2-1 t through whichthe `sullporting rodl 18 is loosely inserted before the same is secured into one of the bolt holes 13.I In screwing the supporting rod 18` into one of the "bolt holes 13, the shoulder`19 thereon engages the base :23 and securely clamps the saine onto the cylinder casting 7 with the anchor pin 20 positioned equi-distant between the respective pair of valves 10.

A tubular spindle is mounted in the seat 17 of the bearing head 15, for both rotary and endwise movements, and has a hand crank 26 secured to its upper end by a transverse pin 27. Extending axially through the tubular spindle 25, is a stem 28 having on its lower end, below said spindle, a valve grapple in the form of a fork 29, the prongs of which are arranged to enter the pin holes 14 in any one of the valves 10. The upper end of the stem 28 is expanded to aiford a bearing 3() through which the pin 27 extends and supports the valve grapple 29 -for common rotation with the tubular spindle 25 but with freedom for lateral wabble motion. The bearing 30 en- I gages the internal wall of the vtubular spindle 25 and holds the upper end of the stem i 28 against lateral movement and is rounded to permit free universal lateral wabble movement of the valve grapple 29. Integrally formed with thebearing 30 and forming1 an upward extension of the stem 28, is a. nger piece 31. This finger piece 31 projects above the `tubular spindle 25 and affords means by which the valve grapple 29 may be guided into the pin holes 141: of one of the valves 10.

To grind a valver in its seat with the improved tool, it is only necessary to operate the crank 26, it, of course, being understood that before the grinding takes place, a suitable abrasive is applied to the surfaces of the valve and its seat to be ground. In grinding a valve, suflicient pressure, to cause the abrasive to cut, is applied by an inward pressure on the crank 26, while turning the same. With the valve ,grapple 29 mounted with freedom for universal lateral wabble motion, a lvalve is ground true in its seat, for the reason that there is no lateral pres- .sure on the valve tending to grind its seat into an oblong form. After one valve of a given pair is ground, the other one thereof may be ground by raising thev bearing head 15 to carry the same out of contact of the anchor pin 20 and then move the same laterally and inward to carry the anchor pin 20 into the respective hole 21 and thereby securely hold said bearing head with the valve grapple properly positioned over the respective valve to be ground. As previ-` ously stated, the prongs of the valve grapple are guided into the pin seats 14: by means of the linger piece 31.

The above described valve-grinding and reseating tool, while extremely simple and of comparatively small cost to manufacture,

has, in actual usage, proven highly eliicient Lfor the purpose had in view. It is also evident .that the tool may bel very quickly applled to or removed from a cylinder casting, or when applied to a cylinder, shifted from one valve to the other of a given pair. As the tool is very compact, the same, when not in use, will occupy very little space in the tool box. I

In place of the valve grapple 29, the stem 28 may be provided with a valve seat-forming device or cutterv` by the use of which a valve seat may be reformed. This device may be in the form of a separate tool, or the tool maybe provided with interchangeable stems equipped, the one with a valve grapple and the other with a valve seat-forming device. The, wabble motion in the tool is, of course, just as important in the valve seat-forming device as it is in the valve grapple.

WhatI claim is:

1. A valve-grinding tool comprising a bearing head, a tubular spindle. rotatively mounted in the bearing head with freedom for bodily movement toward and from the work, means for rotating the spindle, and a valve-grapple having a'stem extending into the spindle and secured thereto for common movements therewith and with freedom to permit, universal lateral wabble movement of the grapple stem therein.

2. A valve-seating tool comprising a rigidly held support having a swinging bearing head, driving means rotatively mounted in the bearing head with freedom for bodily movement toward and from the work, and a valve seat-forming device secured to the driving means for common movements therewith and .with freedom for universal later-al wabble movement with respect to the work.

3. A valve-grinding tool comprising a supporting rod, a bearing head mounted on said rod for lateral swinging movement over several valves, av valve grapple carried by said bearing head, and means for anchoring said bearing head in predetermined positions with the valve grapple positioned over any one of the valves.

4. A valve-grinding tool comprising an anchor having a supporting rod and a stud, a bearing head mounted on said rod for axial and lateral swinging movements thereon over several valves. a valve grapple carried by the bearing head, said bearing head having several bores any one of which may be brought into interlocking engagement with said stub, by lateral swinging and axial movements of the bearing head on the supporting rod, for positioning the valve grapple over any one of the valves, .and means for operating the valve grapple.

5. A valve-grinding tool comprising an anchor having a supporting rod and a tapered stud, a bearing head mounted on said rod for axial and lateral swinging movements thereon over several valves, a

said bearing heed having several bores any one of which may be brought into nterlocking engagement with said stub, by lateral swinging and axial movements of the bearing head on the supporting rod, for positioning the valve grapple over any one of the va] ves,`seid tapered pin also eiord ing a support for the bearing heeft" when eX- tending into one of the boresthereof, and means for operating the Valve grapple.

6. A portable valve-seating" tool eomprsing a fixed support, e bearing head mounted ment over several valves, and le va Ve seat- `formi`ng devioefeerred by thebearing heed 15 with freedom for `endvvise and unlversal lateral wabble movements. y y y In testimony whereof I ex my signature .In presence of two witnesses. y WALLACE B. MARTIN y Witnesses: y y H CLARA DEMAREST, HARRY D, KILGoRm.'

opiem of ikllajlm )piment muy be ab'minefor` uve centr each, by mddi'en the w immonet et Mmmm,"

y t eehinmon, JILU. p 

